Give privilege to users in TerminalServerAdmins

Revives the currently unused TerminalServerAdmins group.

Users in this group will eventually have special privileges for session
management. Currently, members of this group will be allowed to
list all sessions with the xrdp-sesadmin command.

sesman/eicp_process.c

@@ -36,6 +36,8 @@
 #include "pre_session_list.h"
 #include "scp.h"
 #include "sesman.h"
+#include "sesman_access.h"
+#include "sesman_config.h"
 
 /******************************************************************************/
 
@@ -79,6 +81,10 @@ process_sys_login_response(struct pre_session_item *psi)
                 psi->client_trans->callback_data = (void *)psi;
                 psi->login_state = E_PS_LOGIN_SYS;
                 psi->uid = uid;
+                // For system logins, don't allow admin access
+                //psi->is_admin = access_login_mng_allowed(&g_cfg->sec,
+                //                psi->username);
+                psi->is_admin = 0;
             }
         }
     }